As some former Miss Universe contestants posted photos of them enjoying Nia Sanchez's bachelorette party in Las Vegas, Miss USA's best friend Tegan Martin is not part of the celebration.

Is their friendship over?

Miss USA 2014 Nia Sanchez invited over some former Miss Universe contestants in her weekend party in Las Vegas recently, from sun down to sun rise.

Among those invited were former Miss Universe 2014 contestants such as Miss Philippines Mary Jean Lastimosa, Miss Indonesia Elvira Devinamira, Miss Belgium Anissa Blondin, Miss Austria Julia Furdea and many others.

Miss USA contestants were also seen in the bachelorette party, such as Miss Nevada USA 2015 Brittany McGowan and Miss USA 2009 Kristen Dalton, Nia Sanchez's Instagram account showed.

The photos featured them having fun in the pool during the morning party and getting together during the night club party.

Nia Sanchez stood out among the other Miss Universe contestants by wearing special dresses and swimsuits that had a wedding veil hanging on it.

During the Miss Universe 2014 pageant earlier this year, Miss Australia Tegan Martin was seen holding hands with Nia Sanchez during the telecast interviews. Being roommates, the two have formed a friendship that extended even after the pageant.

In the report on the Daily Mail, the two pageant best friends met with one another again in Disney World in Orlando, Florida just a few days after the pageant finals.

Nia Sanchez once worked as a Disney character in a Disneyland theme park prior to joining the pageant.

Pageant fans expected Tegan Martin to be the first to attend the bachelorette party more than many of the former Miss Universe contestants, but the Australian beauty made no appearance.

One reason could be her busy schedule as she is part of the Australian version of "Celebrity Apprentice," which is currently in production.

However, Tegan Martin herself has posted a statement on Instagram which may be another reason why she did not make it.

She is attending Nia Sanchez's wedding herself in October.

"Tag someone you know who is getting married!! I'm tagging my best friend @realniasanchez who I cannot wait to watch marry the love of her life in October," the Australian beauty said.